'aerostat' originates from French, specifically the word 'aérostat,' where 'aéro-' meant 'air' and '-stat' meant 'standing or stationary.'

'aérostat' transformed into the English word 'aerostat' and eventually became the modern English word 'aerostat.'

Initially, it meant 'a device that remains stationary in the air,' but over time it evolved into its current meaning of 'a lighter-than-air aircraft.'